Bug 634004 - Implement accessibility API support for html:details and html:summary elements, r=surkov
This implements the roles, states, and action names, but omits the state change event part that is currently made impossible by us recreating the html:summary accessible once it toggles the html:details open state. This is probably due to some reframing causing us to recreate the accessible. Suggest to move that to a separate bug and implement the basics now and the event later.
MozReview-Commit-ID: FEi5RIXdkG0